Leonia, NJ -- U.S. borough in New Jersey Population (2000): 8914 Housing Units (2000): 3343 Land area (2000): 1.505422 sq. miles (3.899025 sq. km) Water area (2000): 0.117531 sq. miles (0.304403 sq. km) Total area (2000): 1.622953 sq. miles (4.203428 sq. km) FIPS code: 40020 Located within: New Jersey (NJ), FIPS 34 Location: 40.863413 N, 73.988273 W ZIP Codes (1990): 07605 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Leonia, NJ Leonia